49) There is not a viable replacement for reliable practice whether one needs to comprehend an idea completely or one needs to score better. Q: What is the value of the equilibrium constant, Kp, for the reaction? Belgium, (+ 31) B. D. TP and CP are always at the same pressure. 234) B. K=0 Understudies who are planning for Central board assessments in Chemistry specifically CBSE, ICSE, and NIOS Board. C. Xd2+ + 2 H+ Xd + H2 D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture E. 8.89. CH3Cl(g)+Cl2(g)CH2Cl2(g)+HCl(g), H=105.8 kJ, Use the standard reaction enthalpies given below to determine Hrxn for the following reaction: 2NH 3 (g) N 2 . 995) For the reaction : 2HI(g) H2 (g)+ I2 (g), the degree of dissociated () of HI(g) is related to equilibrium constant Kp by the expression: For the reaction H2(g) + I2(g) 2HI(g) the equilibrium constant kp changes with. Determine the value of . - The relationship between vapor pressure and temperature is linear. N2(g)+O2(g)+Br2(g)2NOBr(g). The statements in the tables below are about two different chemical equilibria. It changes only with changes in temperature of the system. and -333 kJ Answer Use these reactions and their equilibrium constants to predict the equilibrium constant for the following reaction: 7) When a reactio. Since there is not a viable alternative for it. Ukraine, (+ HI(g)12H2(g)+12I2(g), The equilibrium constant is given for one of the reactions below. 0.183 CBSE MCQs for all the classes and subjects are provided online or you can view them on our site. C-H 414 Sweden, (+ What is the osmotic pressure of a solution made by dissolving 45.0 g of glucose, C6H12O6, in enough water to form 225.0 mL of solution at 36.0 C ? A. United States, (+ Which of the following statements is TRUE? E. Xe. 33) B. In each table, there may be one statement that is false because it contradicts the other three statements. y+4y+5y=26e3t,y0=1,y0=5. D) [H3O+][F-] / [HF] 48) Portugal, (+ A reaction of the type 2A P has the following rate law: rate = k[A]2. 2 HI(g) H2(g) + I2(g) Kc= 0.016 @ 800 K Let "x" represent the change in concentration of the hydrogen gas. -4.56C 4.19 [A] and [P] denote the concentrations of A and P, respectively. 8.36 torr D) only products are present A. After equilibrium was reached, the partial pressure of NO dropped to 320 torr. 30.5 C D. The value of pH is somewhat lower than 2.13. 2 HD(g) H2(g) + D2(g) Kc = 0.28 A. If the equilibrium constants for the formation of H S from H 2S is 1.0 107 and that of S 2 from H S ions is 1.2 1013 then the concentration of S 2 ions in aqueous solution is - JEE Main 2018 9. C. surface tension The equilibrium constant is given for one of the reactions below. South Africa, (+ H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . A. Pakistan, (+ Ghana, (+ B. CP is always at a higher temperature relative to TP. E) 4 Fe (s) + 3 O2 (g) 2 Fe2O3 (s), 29) Which reaction will shift to the right in response to a decrease in volume? A) N2 (g) + 3H2 (g) 2NH3 (g) (Assume ideal behavior.). 960) (i) The value of K increases as the system approaches equilibrium. The equilibrium constant (Kp) for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 (g) PCl3 (g) + Cl2 (g) . E) all of the above, 32) Consider the following reaction at equilibrium: 1.9 10-4 M E. 48.1 J, [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. 91) Q: If the initial concentration of SO2Cl2 is 1.00 M, how long will it take for the concentration to decrease to 0.72 M ? D) only products are present In a cell defined by Xs(s) | Xs2+(aq) || Xo3+(aq) | Xo(s), what amount of charge q needs to run through the cell to add 0.25 g of Xo(s) with atomic mass 107 g mol-1 to the electrode. B. B. E) only reactants are present. H2(g)+I2(g)2HI(g) Which of the following statement is/are true? Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. - A liquid can be converted to a gas by cooling. At equilibrium the total pressure in the container is 1.300 atm. A. It can be represented as. Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. B) 2500 Sn(s)|Sn2+(aq)NO(g)|NO3(aq),H+(aq)|Pt(s), 3Sn(s)+2NO3(aq)+8H+(aq)3Sn2+(aq)+2NO(g)+4H2O(l), [Use tabulated half-cell potentials to calculate Grxn for each of the following reactions at 25 C] Nepal, (+ The rate constant for the reaction is 9.45 10-5 s-1 at 478 K. The half-life of the reaction when the initial [CH3NC] is 0.030 M is ________ s. From Midterm 3: H2(g) + I2(g) . Consider the chemical equation and equilibrium constant at 25C: C. 0.222 [An aqueous solution contains 32% HCl by mass] at a certain temperature. B. C. 1.94 D) 2500 E. 0.371, From Midterm Exam 2: B. HPO42- 355) Part A: What is the value of E for the combustion of the fuel? D. increase reactant Note: Names of real elements have been changed to 'Xd'. C) N2 (g) + 3H2 (g) 2 NH3 (g) At the same temperature, pure liquid A has a vapor pressure of 220 torr, while pure liquid B has a vapor pressure of 400 torr. Afghanistan, (+ Xd(s) | Xd2+(aq) || H+(aq) | H2(g) | Pt Phenomenon after H2 (hydrogen) reacts with I2 (iodine) This equation does not have any specific information about phenomenon. C) decrease the value of the equilibrium constant Additionally, you can reconsider all Chemistry sections appropriately whenever and save significant season of yours during class tests and yearly tests readiness. Guinea, (+ Equilibrium hydrogen is defined as a sample of hydrogen existing at the equilibrium ratio of orthohydrogen-parahydrogen at a given temperature (shown by the crimson dash-dot line in the figure). B. H2(g) +I2(g) 2HI(g) Using the Equilibrium Constant (cont) E.g.2 For the reaction: PCl5(g) PCl3(g) + Cl2(g), Kc = 0.800 M at 340oC. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction 2 HBr(g) H2(g) + Br2(g) Kc = ? [An object can possess kinetic energy, the energy of motion, and/or potential energy, the energy of position. C. 150 g A. Thusly, students who have started their board test course of action can include the NCERT Chemistry MCQ Questions for Class 12 with Answers. 0.043 The system is losing 115 J, while the surroundings are gaining 115 J, A. energy associated with the temperature of an object, D. energy associated with the motion of an object, D. energy associated with the position or composition of an object. Terms T&C. 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Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. 92) Provide an explanation. By clicking Agree & join, you agree to the Study24x7 B. Calculate K and Kp for this reaction. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. H2 (g) + Br2 (g) 2 HBr (g) Where to download CBSE MCQs for all Classes and Subjects? Suppose 0.811 mol of HI is placed in a 1.50-L container at 500 K. What is the equilibrium concentration of H2 (g)? 2NO2 (g) 2NO (g) + O2 (g) Determine the value of the missing equilibrium constant. system remains constant during its change from Examples:- (i) H2(g) + I2(g) 2HI(g) the initial to final state. Q: If a reaction mixture is initially 0.20 M in X, what is the concentration of X after 151 seconds? The most easily measurable form of energy comes in the form of heat, or enthalpy. Propane has a normal boiling point of 42.0C and a heat of vaporization (Hvap) of 19.04 kJ/mol. . Tajikistan, (+ 968) From Midterm 3: 224) - 1.92 x 103 kJ/mole CO2 (s) + H2O (l) H+ (aq) + HCO3- (aq) 32) C. -2.97C C. Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction equals the rate of the reverse reaction. Albania, (+ 1) (Pg.5) (c) Isobaric process:- An isobaric process is In a homogeneous equilibrium, all the defined as one in which the pressure of the reactants and products are in the same phase. C. 1.28 Tajikistan, (+ A. 2) Which one of the following is true concerning the Haber process? - The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. If you have any query regarding CBSE MCQs, drop a comment below and we will get back to you at the earliest. When the equilibrium constant is written with the gases in terms of partial pressure, the equilibrium constant is written as the symbol K_\text p K p. The subscript p stands for penguins. 48.6 C All reactant and product concentrations are constant at equilibrium. with forward (A P) rate constant k and reverse (A P) rate constant k' is correct? Use the following reactions and given H values. The vapor pressure of a certain sample has been measured at two different temperatures and the results are P1 = 160 kPa at T1 = 240 K and P2 = 840 kPa at T2 = 270 K. Determine the molar vaporization enthalpy, Hvap, from these results. D) 2N2 (g) + O2 (g) 2 O (g) The reaction mixture will contain [A]=0.1M and [B]=1.0M. D. 12.9 kJ Careful quan titative dehydration experiments [17] show that at 173 K each protonated form o f the anion has a distinct resonance, see Figure 8 . 380) C. 0.037 Which of the following is TRUE if E sys = - 115 J? 2A+B2C+2D +25.5 kJ [Nitromethane (CH3NO2) burns in air to produce significant amounts of heat. B. 2075 Daily act of different subject shrewd MCQs will assist with fostering a solid comprehension of every theme which you will recollect till date of your tests. Chemistry MCQ For Class 12 Chapter astute with Answers PDF Download. ), [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. B. Here's an example. Xx+(aq) + e-(aq) Xx(s) , Poland, (+ chemical equilibrium class-11 1 Answer +1 vote answered Feb 2, 2022 by Princebarnwal (34.9k points) selected Feb 6, 2022 by Jeewant Best answer For the given reaction, Kp = (pH I)2 (pH 2)(P I 2) ( p H I) 2 ( p H 2) ( P I 2) Zimbabwe, (+ A2 (g) 2 A (g). From Midterm Exam 2: A) decrease the partial pressure of O2 (g) Hydrogen and nitrogen react to form ammonia according to the following balanced chemical equation: \ce {3H2 (g) + N2 (g) <=> 2NH3 (g)} \nonumber Values of the equilibrium constant at various temperatures were reported as K_ {25C} = 3.3 \times 10^8, K_ {177C} = 2.6 \times 10^3, and K_ {327C} = 4.1. C. 11.70 A. BF3 Determine the cell notation for the redox reaction given below. Spain, (+ E. 13.02, From Midterm Exam 2: 52) C. 3.42 torr 351) 100 Calculate Hrxn for the following reaction: where n represents the stoichiometric coefficients] 966) A) some removal of from the reaction vessel (V and T constant) Based on the freezing point depression constant for water, Kf = 1.86 K /(mol kg-1), what is the freezing temperature of the mixture. B) the rates of the forward and reverse reactions are equal. Consider the chemical equation and equilibrium constant at 25C: H2 (g)+I2 (g)2HI (g) , K=6.2102 Calculate the equilibrium constant for the following reaction at 25C: HI (g)12H2 (g)+12I2 (g) C=O 799 - A gas can be converted into a liquid by decreasing the pressure of a gas sample. C. HF [Ammonia, NH3, is a weak base with a Kb value of 1.8105.] (a) total pressure(b) catalyst used(c) amount of H2 and I2(d) temperature, (a) 2 10-4(b) 4 10-2(c) 2 10-2(d) 1 10-2, (a) bar min-1, bar2 min-1(b) bar min-1, bar1/2 min-1(c) bar1/2 min-1, bar2 min-1(d) bar min-1, bar1/2 min-1, (a) 9 times(b) 4 times(c) 16 times(d) 8 times, (a) NH4NO2 N2 + 2H2O(b) NO + O3 NO2 + O2(c) 2NO + Br2 2NOBr(d) CH3CHO CH4 + CO, (a) mol L-1 s-1(b) s-1(c) mol-2 L s-1(d)mol L-1, (a) (i)2, (ii) 1(b) (i)2,(ii) 2(c) (i) 1, (ii) 1(d) (i) 1, (ii) 2, (a) temperature of the reaction(b) extent of the reaction(c) initial concentration of the reactants(d) the time of completion of reaction, (a) Rate = k [O] [O3](b) Rate = k [O3] [O2]-1(c) Rate = k [O3](d) Rate = k [O2] [O], (a) zero order reaction(b) first order reaction(c) second order reaction(d) third order reaction, (a) order of a reaction(b) molecuiarity of a reaction(c) fast step of the mechanism of a reaction(d) half-life of the reaction, (a) the order and molecuiarity of the slowest step are equal to one(b) molecuiarity of the reaction can be zero, one or two(c) molecuiarity of the reaction can be determined only experimentally(d) more than one reacting species are involved in one step, (a) the order and molecuiarity of the slowest step are equal to one, (a) the rate of fastest intermediatestep(b) the sum total of the rates of all intermediate steps(c) the average of the rates of all the intermediate steps(d) the rate of slowest intermediate step, (d) the rate of slowest intermediate step, (a) temperature(b) mechanism of reaction as well as relative concentration of reactants(c) molecularity(d) pressure, (b) mechanism of reaction as well as relative concentration of reactants, (a) inversely proportional to the concentration units(b) independent of concentration units(c) directly proportional to concentration units(d) inversely proportional to the square of concentration units, (a) 2 10-2 s-1(b) 4 10-4 s-1(c) 20 s-1(d) 2 10-4 s-1, (a) EaR(b) Ea2.303R(c) 2.303Ea.R(d) Ea2.303, (a) mol L-1s-1(b) s-1(c) L mol-1s-1(d) L2mol-2s-1, (a) triple(b) increase by a factor of 4(c) double(d) remain unchanged. B) 0.50 D. 6.36 torr 5.99 torr An equilibrium mixture contains 2 moles of sulphur dioxide, 1 mole of oxygen and 6 moles of sulphur trioxide. B) N2O4 (g) 2NO2 (g) 6) The equilibrium-constant expression depends on the ________ of the reaction. 2 NO(g) + O2(g) 2 NO2(g) Hrxn = ? 28) Which reaction will shift to the left in response to a decrease in volume? The P-M AS-NM R chemical shift changes from -15.6 ppm ( 6 -hydrate) to - 1 1.0 ppm (anhydrous). b. Determine the value of the missing equilibrium constant. A P A. 351) 11.90 The NCERT Solutions for the questions are present on our site or you can find them online too. Nigeria, (+ 230) Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? A. 27) How is the reaction quotient used to determine whether a system is at equilibrium? B. Catalysts have no effect on equilibrium situations. C. 2.13 10-14 Dynamic equilibrium in a chemical reaction is the condition in which the rate of the forward reaction is lower than the rate of the reverse reaction. Compute the pH at 25C after 3 mL of the base has been added. E. 53.1C, The specific heat capacity of liquid water is 4.18 J/g-K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 25.1C to 65.3C? What is the vapor pressure of propane at 20.0 C? An analyte containing 0.12 L of a 0.025 M solution of a strong acid is titrated with a 0.220 M solution of a strong base. 230) A(g) + 3B(g) AB3(g) Kc = 478, The equilibrium constant is given for two of the reactions below. is Keq = 2.80 102 at 999 K. At equilibrium, ________. D. 39.5 C, In general, which of the following types of force/interaction is responsible for the existence of the condensed phases of matter? Understudies who are getting ready for designing and clinical selection tests like NEET, IIT JEE, AIIMS, JIPMER and SAT Exams in Chemistry. The osmotic pressures required for this process can be as high as 18.6 atm . Find the equilibrium amounts of these compounds if they all start out at 0.120 M. Solution: Determine Qc so that you know which direction the reaction will proceed. Coming up next are not many significant advantages of CBSE MCQs with Answers for Class 12 Chemistry distributed by cbseMCQ.com: Q1. 2HI(g) I, M 1.00 1.00 0 C, M -x -x +2x . Relationships between chemical equations and the expressions of equilibrium constants The expression of equilibrium constant depends on how the equilibrium equation is written. E. 9.40, A mixture containing 20.6 g of ice (at exactly 0.00 C) and 70.3 g of water (at 62.9 C) is placed in an insulated container. C. remove reactant By rehearsing more second Year Chemistry MCQs with Answers Pdf Download, understudies can work on their speed and precision which can help them during their board test. Which metal ion in the list is most difficult to reduce? C. CF4 Calculate the equilibrium constant for the following reaction at 25C: h) A ask is sealed at 600 K 1with partial pressures of Hg = 2.50 atm and I g = 1.27.0 am. It permits everybody to download CBSE Class 12 Chemistry Chapter-wise MCQs question keep money with addresses in free pdf organization and practice them for additional investigations. Understudies can get to the CBSE NCERT MCQ Questions of Class 12 Chemistry with Answers Pdf of all Chapters liberated from cost from here. E) Q is the same as Keq when a reaction is at equilibrium. You can likewise reconsider all Chemistry sections appropriately and save time during your group tests and tests. D) N2 (g) + 3H2 (g) 2NH3 (g) Hydrogen and iodine react to form hydrogen iodide, like this: H_2 (g) + I_2 (g) rightarrow 2 HI (g) Also, a chemist finds that at a certain temperature the equilibrium mixture of hydrogen, iodine, and hydrogen iodide has the following composition: Calculate the value of the equilibrium constant K_p for this reaction. Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. 44) Maldives, (+ You'll get a detailed solution from a subject matter expert that helps you learn core concepts. y+4y+5y=26e3t,y0=1,y0=5.y^{^{\prime \prime }}+4y^{^{\prime Utilizing the assets accessible you can score well in the test. D. 173 g A. PO43- C) K does not depend on the concentrations or partial pressures of reaction components. D) only products are present Portugal, (+ 41) While the crate is moving, the ramp exerts a constant frictional force on it that has magnitude 65.0N65.0 \mathrm{~N}65.0N. (a)(a)(a) What is the total work done on the crate during its motion from the bottom to the top of the ramp? E. 0.158. South Korea, (+ - The vapor pressure of a liquid increases with increasing temperature. C. 840 J C) 6.44 105 - A gas can be converted into a liquid by increasing the pressure of a gas sample. At body temperature (37C), Kw=2.41014] Rehearsing NCERT Online Chemistry Objective Questions For Class 12 Pdf Answers is perhaps the most ideal way to plan for the CBSE Class 12 board test. 992) France, (+ B. increase volume Provide your answer in units of volts (V). E. The reverse reaction is favored. 880) From Midterm 3: 855) B) a decrease in the total pressure (T constant) In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends on. Q: Find the volume of methane measured at 298 K and 1.72 atm required to convert 0.620 L of water at 298 K to water vapor at 373 K. The enthalpy change for converting 1.00 mol of ice at -50.0C to water at 70.0C is __________ kJ. 2HI (g) H2 (g) + I2 (g) D. 0.420 B. 263) E. 0.169 M, From Midterm Exam 2: Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature.] Saudi Arabia, (+ D) [CO2][H2O] / [H+][HCO3-] B. density A. Belgium, (+ 12.72 H2 (g) + I2 (g) 2HI (g) Top 2 posts Page 1 of 1 B. Which statement is true of an endothermic reaction? \end{array} Exams . D. 13.16 Calculate the standard cell potential, Ecell, for the cell defined by the reaction New Zealand, (+ Egypt, (+ 233) Thank you for your participation! 2CO2 (g) 2CO (g) + O2 (g) H = -514 kJ Another example of a chemical equation that can be used to explain is given below: Equation: 2 S O 2 ( g) + O 2 ( g) 2 S O 3 ( g) Equilibrium Constant: K C = [ S O 3] 2 [ S O 2] 2 [ O 2] Moreover, in terms of finding equilibrium constant for gases, partial pressure is taken into account. D.2.08 10-2 J A) 2HI (g) H2 (g) + I2 (g) (R = 0.0821 L atm/ (K mol)) A. From Midterm 3: B) reactants predominate Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. An aqueous solution contains 0.10M H 2S and 0.20M H Cl . 358) is given by, 21) The equilibrium constant for the gas phase reaction United Kingdom, (+ 977) C. 2.8 10-5 M C) slow the reverse reaction only (+ The reaction mixture will contain [A]=0.1M and [B]=1.0M. Let us consider that one mole of H2 and one mole of I2 are present initially in a vessel of volume V dm3. 971) 960) Q8. C. The reciprocal concentration, [A]-1, changes linearly with time. Note: Names of real elements have been changed to 'Xs' and 'Xo'. B) reactants predominate E. In equilibrium, the ratio [P] / [A] is equal to k / k'. The people who need to get the passing marks in the CBSE class twelfth board test can use the Chemistry Multiple choice requests to practice. 9.64 E. There is not enough information to calculate the Kw. D. 0.087 8) The equilibrium expression for Kp for the reaction below is ________. Beside the PDF archive of Chemistry we are giving the electronic test which will help in everyday act of the Mathematical Problems. Chemistry MCQ For Class 12 Chapter savvy with answers Online Test is a sort of Mock Test that will assist you with taking care of the few issues of Std twelfth NCERT Chemistry Books. 20) The heat capacity of the calorimeter is 4.90 kJ/C. D. capillary action E) [SO3] / [SO2][O2]2, 16) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? A. ion-ion E) only reactants are present, 24) The equilibrium constant for the gas phase reaction [The vapor above an aqueous solution contains 17.9 mg water per liter at 25 C] Switzerland, (+ Equilibrium is when the rate of the forward reaction equals the rate of the reverse reaction. B) [CO2] / [H+][HCO3-] 966) 31) B. SiH4 A. You can utilize the quick links on our page to view or download the CBSE MCQs of all classes in an easy way. We reviewed their content and use your feedback to keep the quality high. The equilibrium constant expression for the reaction is Kc = [HI]2 [H2][I2] Substituting the equilibrium concentrations into the equilibrium expression, Kc = (0.30)2 (0.012)(0.15) = 50 The magnitude of the equilibrium constant is 50 for the temperature at which the data was collected. 57.0 kJ B. United Kingdom, (+ C) addition of some to the reaction vessel (V and T constant) South Africa, (+ Enter the email address you signed up with and we'll email you a reset link. Nepal, (+ 48) Equilibrium constant Kp is equal to the partial pressure of products divided by partial pressure of reactants and the partial pressure are raised with some power which is equal to the coefficient of the substance in balanced equation. For the reaction H2(g) + I2(g) 2HI (g), the standard free energy is G^ > 0. Part B: Calculate the boiling point of the solution above. B. H2SO3/HSO3- 968) Q: What is the percent ionization of ammonia at this concentration? 6.41 1) c. Which metal in the list is most reactive? Mauritius, (+ E. methanol, Give the major force between ethanol and water. Pakistan, (+ Turkey, (+ A. F2 Part B: Calculate the work done, w. [A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. Isotonic saline solution, which has the same osomotic pressure as blood, can be prepared by dissolving 0.923 g of NaCl in enough water to produce 100. mL of solution. What is NCERT Exemplar and where can we get its Solutions? C. OH- 49) Poland, (+ Here you will find NCERT MCQ Questions for Class 12 Chemistry with Answers PDF Free Download based on the important concepts and topics given in the textbook.This may assist you to understand and check your knowledge about the chapters. Comprehend the ideas and practice Objective Type Questions for twelfth Class Chemistry however much you can to score well. 6 H2(g) + 6 D2(g) 12 HD(g) Kc = ? A) N2O4 (g) 2NO2 (g) Consider the first-order decomposition of compound A according to 91) Kc depends on how the chemical equation is written, but not on how the reaction is carried out. The final temperature of the mixture upon reaching thermal equilibrium is 27.9 C] E) [H+][HCO3-], 18) Which of the following expressions is the correct equilibrium-constant expression for the reaction below?
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